class Zhushi // lei sheng ming
{  //lei ti de zuo da kuo hao
	public static void main(String args[]) {
		int sum=0,i=0,j=0;
		for(i=1;i<=100;i++) //xun huan yu ju
		{
			sum = sum+i;
		}
		System.out.println(sum); //shu chu sum
	}
}  //lei ti de you da kuo hao
